A kind of fracturing method of normal pressure shale gas reservoir

Abstract

The invention provides a fracturing method of a normal-pressure shale gas reservoir. The fracturing method comprises the following steps that firstly, reservoir evaluation parameters are obtained; secondly, fracturing construction parameters are determined, specifically, the viscosity, the displacement and the using amount of fracturing liquid and the particle size and the using amount of proppingagents are determined; and thirdly, fracturing construction is conducted, specifically, the reservoir is subjected to segment-by-segment fracturing construction through a spiral-slug-type mixed particle size sand-adding mode. According to the fracturing method of the normal-pressure shale gas reservoir, the complexity index of cracks of the normal-pressure shale gas reservoir can be effectively increased, and the fracturing transformation effect of the normal-pressure shale reservoir is improved accordingly.

Description

technical field

[0001] The invention relates to a fracturing method for normal-pressure shale gas reservoirs, belonging to the field of petroleum exploitation. Background technique

[0002] Atmospheric pressure shale gas reservoirs refer to shale gas reservoirs with a formation pressure coefficient less than 1.1, and the resources of this type of gas reservoirs are huge in my country. Due to the low formation pressure coefficient and some inherent characteristics, the high-pressure shale formation fracturing technology is not suitable for the fracturing operation of normal-pressure shale gas reservoirs. For example, micro-fractures and bedding / texture fractures of different scales in normal-pressure shale gas reservoirs are generally narrow. The system cannot be effectively filled and supported, resulting in poor fracture complexity and post-fracture stabilization effects. Compared with high-pressure shale reservoirs, the fluid loss during fracturing in normal-pressure sha...